Chapter 135:2Dwelling in the Sukkah

2. One must treat the sukkah with dignity, so that one will not view
mitzvos as being cheap ("shelo tihye mitzovs bezuyos alav"). Therefore, one
should not bring utensils that are not dignified ("einom mechubadim") into
the sukkah. [This includes] pots, a jug used to draw water, the
receptacles used to store flour, a kneading trough, a large kettle, a
frying pan, a mortar, and the like. Similarly, one must remove plates after
one has eaten. Glasses and other drinking utensils may be left in the sukkah.

It is customary not to bring an earthenware candleholder into the sukkah,
because it can become disgusting ("mo'us"). Similarly, one should not carry
out any disrespectful activity [in the sukkah], for example, washing pots
or plates. One may, however, rinse cups. It is certainly forbidden to
urinate in the sukkah. [This applies] even if one urinates into a
receptacle, and even if one usually does so inside one's home (that is,
into a receptacle). Sexual relations are permitted in the sukkah, because
the essence of the mitzvah, is [that a] person [should dwell in the sukkah]
together with his wife (as they would in the house).

The sukkah is not disqualified if one brings utensils that are not
respectable into it. One should not, however, recite the blessing [for the
mitzvah of sitting in a sukkah] "leisheiv ba'sukkah," until one removes them.